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Stockholders' Equity - Summary of Shares Repurchased Under Stock Purchase Program (Detail) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Summary Of Shares Repurchased Under Stock Purchase Program [Abstract]
Number of shares repurchased		23,050
Average price of shares repurchased		$ 40.92
Shares remaining to be repurchased	194,723	211,914

X

- Details

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Namespace Prefix:	banf_
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X

- Definition

Number of stock bought back by the entity at the exercise price or redemption price.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

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- Definition

The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

+ References

No definition available.

+ Details

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X

- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655

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Period Type:	duration